Abstract: According to the fundamental concept of two-fluids,the governing equations for description of gas-droplets turbulent combustion in an afterburner of jet engine have been formulated,in which the important injection effect of the droplets in afterburner has been taken into detailed consideration.The Farve average method has been employed to represent the effects of turbulent combustion in the afterburner.The multiple time scale turbulent k-ε model proposed by Kim is applied to calculating the eddy viscosity of the turbulenct field.The heat flux radiation model has been taken to consider the effect of radiation at high temperature,the simple one step chemical reaction model is used to approximate the combustion of kerosene.The chemical reaction rate is assumed to be controlled by eddy break up process,and the reaction rate is modified by premixed reaction model in Arrhenius form.The application of SIMPLE algorithm indicates that the present twofluid model can calculate the two-phase turbulent combustion in the jet engine afterburner and obtain reasonable results.